package com.lzyc.ybtappcal.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;
import com.lzyc.ybtappcal.R;

/**
 * Created by lovelin on 2016/6/20.
 * 个人界面 头像边框的自定义View
 */
    public class MyRoundImageView extends ImageView {
        private int mBorderThickness = 0;
        private Context mContext;
        private int defaultColor = 0xFFFFFFFF;
        // 如果只有其中一个有值，则只画一个圆形边框
        private int mBorderOutsideColor = 0;//图片的外边界
        private int mBorderInsideColor = 0;//图片的内边界
        // 控件默认长、宽
        private int defaultWidth = 0;
        private int defaultHeight = 0;

        public MyRoundImageView(Context context) {
            super(context);
            mContext = context;
        }

        public MyRoundImageView(Context context, AttributeSet attrs) {
            super(context, attrs);
            mContext = context;
            setCustomAttributes(attrs);
        }

        public MyRoundImageView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            mContext = context;
            setCustomAttributes(attrs);
        }

        private void setCustomAttributes(AttributeSet attrs) {
            TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.RoundImageView);
            //边界的宽度
            mBorderThickness = a.getDimensionPixelSize(
                    R.styleable.RoundImageView_border_thickness, 0);
            //外边界的颜色
            mBorderOutsideColor = a.getColor(
                    R.styleable.RoundImageView_border_outside_color,defaultColor);
            //内边界的颜色
            mBorderInsideColor = a.getColor(
                    R.styleable.RoundImageView_border_inside_color, defaultColor);
        }

        @Override
        protected void onDraw(Canvas canvas) {
            //获取到图片的对象
            Drawable drawable = getDrawable();
            if (drawable == null) {
                return;
            }

            if (getWidth() == 0 || getHeight() == 0) {
                return;
            }
            this.measure(0, 0);
            //NinePatchDrawable绘制一个可伸缩的位图图像
            if (drawable.getClass() == NinePatchDrawable.class)
                return;
            Bitmap b = ((BitmapDrawable) drawable).getBitmap();
            Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
            if (defaultWidth == 0) {
                defaultWidth = getWidth();
            }
            if (defaultHeight == 0) {
                defaultHeight = getHeight();
            }
            // 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小（针对宽、高为wrap_content布局的imageview，但会导致margin无效）
            // if (defaultWidth != 0 && defaultHeight != 0) {
            // LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
            // defaultWidth, defaultHeight);
            // setLayoutParams(params);
            // }

            int radius = 0;
            if (mBorderInsideColor != defaultColor
                    && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框
                radius = (defaultWidth < defaultHeight ? defaultWidth
                        : defaultHeight) / 2 - 2 * mBorderThickness;
                // 画内圆
                drawCircleBorder(canvas, radius + mBorderThickness / 140,
                        mBorderInsideColor);
                // 画外圆
                drawCircleBorder(canvas, radius + mBorderThickness
                        + mBorderThickness / 2, mBorderOutsideColor);
            } else if (mBorderInsideColor != defaultColor
                    && mBorderOutsideColor == defaultColor) {// 定义画一个边框
                radius = (defaultWidth < defaultHeight ? defaultWidth
                        : defaultHeight) / 2 - mBorderThickness;
                drawCircleBorder(canvas, radius + mBorderThickness / 2,
                        mBorderInsideColor);
            } else if (mBorderInsideColor == defaultColor
                    && mBorderOutsideColor != defaultColor) {// 定义画一个边框
                radius = (defaultWidth < defaultHeight ? defaultWidth
                        : defaultHeight) / 2 - mBorderThickness;
                drawCircleBorder(canvas, radius + mBorderThickness / 2,
                        mBorderOutsideColor);
            } else {// 没有边框
                radius = (defaultWidth < defaultHeight ? defaultWidth
                        : defaultHeight) / 2;
            }
            Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
            canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
                    / 2 - radius, null);
        }

        /**
         * 获取裁剪后的圆形图片
         *
         * @param radius
         *            半径
         */
        public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
            Bitmap scaledSrcBmp;
            int diameter = radius * 2;

            // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片
            int bmpWidth = bmp.getWidth();
            int bmpHeight = bmp.getHeight();
            int squareWidth = 0, squareHeight = 0;
            int x = 0, y = 0;
            Bitmap squareBitmap;
            if (bmpHeight > bmpWidth) {// 高大于宽
                squareWidth = squareHeight = bmpWidth;
                x = 0;
                y = (bmpHeight - bmpWidth) / 2;
                // 截取正方形图片
                squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
                        squareHeight);
            } else if (bmpHeight < bmpWidth) {// 宽大于高
                squareWidth = squareHeight = bmpHeight;
                x = (bmpWidth - bmpHeight) / 2;
                y = 0;
                squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
                        squareHeight);
            } else {
                squareBitmap = bmp;
            }

            if (squareBitmap.getWidth() != diameter
                    || squareBitmap.getHeight() != diameter) {
                scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
                        diameter, true);

            } else {
                scaledSrcBmp = squareBitmap;
            }
            Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
                    scaledSrcBmp.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(output);

            Paint paint = new Paint();
            Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
                    scaledSrcBmp.getHeight());

            paint.setAntiAlias(true);
            paint.setFilterBitmap(true);
            paint.setDither(true);
            canvas.drawARGB(0, 0, 0, 0);
            canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
                    scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
                    paint);
            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
            canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
            // bitmap回收(recycle导致在布局文件XML看不到效果)
            // bmp.recycle();
            // squareBitmap.recycle();
            // scaledSrcBmp.recycle();
            bmp = null;
            squareBitmap = null;
            scaledSrcBmp = null;
            return output;
        }

        /**
         * 边缘画圆
         */
        private void drawCircleBorder(Canvas canvas, int radius, int color) {
            Paint paint = new Paint();
        /* 去锯齿 */
            paint.setAntiAlias(true);
            paint.setFilterBitmap(true);
            paint.setDither(true);
            paint.setColor(color);
        /* 设置paint的　style　为STROKE：空心 */
            paint.setStyle(Paint.Style.STROKE);
        /* 设置paint的外框宽度 */
            paint.setStrokeWidth(mBorderThickness);
            canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
        }
}
